Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Development of Controlled Gas Nitriding Furnace(III) : Application of Controlled Gas Nitriding Process and Evaluation of Durability for SCR420H Annulus gear

질화포텐셜 제어 가스질화로 개발(III) : SCR420H 에널러스기어에 대한 제어질화 적용 및 내구성 평가

  • Won-Beom Lee (Eco-Friendly Thermal Surface Treatment R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Minjae Jung (Department of Materials Science and Engineering, Yonsei University) ;
  • Min-Sang Kwon (Daekyeong Heat treatment Co., LTD) ;
  • Taehwan Kim (Technical Research Institute) ;
  • Chulwoo Moon (Platform Safety Technology R&D Department, Korea Automotive Technology Institute (KATECH))
  • 이원범 (한국생산기술연구원 친환경열표면처리연구부문) ;
  • 정민재 (한국생산기술연구원 친환경열표면처리연구부문) ;
  • 권민상 (대경열처리) ;
  • 김태환 (대원강업) ;
  • 문철우 (한국자동차연구원 플랫폼안전기술부문)
  • Received : 2023.04.24
  • Accepted : 2023.05.15
  • Published : 2023.05.30
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Abstract

This study investigated the effects of KN and process time on the formation of a compound layer at a nitriding temperature of 540℃ for SCR420H material. As a result of controlled nitriding from 3 h to 20 h at KN 1.2 atm-1/2, compound layers were formed up to about 10 ㎛, and an effective hardening depth of about 460 ㎛ was obtained. Initially, an ε+γ' complex phase was formed, and the phase fraction changed over time, and finally, the fraction of ε phase decreased to less than 1%. With higher KN, the compound thickness increased, a pore layer was formed on the surface, and the surface hardness decreased. By applying the controlled nitriding process, it was possible to produce annulus gears with a compound thickness of 12.8 ㎛ and an ε phase of 5% or less. The annulus gears made through controlled nitriding were mounted on a 6-speed transmission and tested for durability. As a result, the durability test of 250,000 km was satisfied, and the transmission efficiency was also confirmed to be expected.

Keywords

Acknowledgement

이 성과는 정부의 소재부품기술개발사업의 재원(No. 20012857) 및 한국생산기술연구원의 지원(No. JH230003)을 받아 수행된 연구입니다.

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